I have changed some of the documentation and added more explanations for
the online reference guide for esys13. I have modified two of the
example source codes to write out the results for Helmholtz problem and
changed one variable name in the diffusion.py code to avoid confusion.

Scons build options for cognac.ivec.org using intel v9.0.026 compilers
Note: Boost is currently not available as a module on cognac. As a result the boost directories used in this build point to my specific boost installation which should be visible to all ivec users. This will get fixed eventually.

The sparse solver can be called by paso now.
the building has been change to reduce some code redundancy:
now all scons SCscripts are importing scons/esys_options.py which
imports platform specific settings.

Some chnages required for oder numarray versions. mai problem is that
operations on array objects with rank 0 sometimes return float rather
than arrays. This problem seems to be fixed in newer releases.